apps/passwd.c

   1 /* ====================================================================
   2  * Copyright (c) 2000-2015 The OpenSSL Project.  All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  *
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  *
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in
  13  *    the documentation and/or other materials provided with the
  14  *    distribution.
  15  *
  16  * 3. All advertising materials mentioning features or use of this
  17  *    software must display the following acknowledgment:
  18  *    "This product includes software developed by the OpenSSL Project
  19  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  20  *
  21  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  22  *    endorse or promote products derived from this software without
  23  *    prior written permission. For written permission, please contact
  24  *    licensing@OpenSSL.org.
  25  *
  26  * 5. Products derived from this software may not be called "OpenSSL"
  27  *    nor may "OpenSSL" appear in their names without prior written
  28  *    permission of the OpenSSL Project.
  29  *
  30  * 6. Redistributions of any form whatsoever must retain the following
  31  *    acknowledgment:
  32  *    "This product includes software developed by the OpenSSL Project
  33  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  34  *
  35  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  36  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  37  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  38  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  39  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  40  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  41  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  42  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  43  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  44  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  45  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  46  * OF THE POSSIBILITY OF SUCH DAMAGE.
  47  * ====================================================================
  48  */
  49
  50 #if defined OPENSSL_NO_MD5 || defined CHARSET_EBCDIC
  51 # define NO_MD5CRYPT_1
  52 #endif
  53
  54 #if !defined(OPENSSL_NO_DES) || !defined(NO_MD5CRYPT_1)
  55
  56 # include <string.h>
  57
  58 # include "apps.h"
  59
  60 # include <openssl/bio.h>
  61 # include <openssl/err.h>
  62 # include <openssl/evp.h>
  63 # include <openssl/rand.h>
  64 # ifndef OPENSSL_NO_DES
  65 #  include <openssl/des.h>
  66 # endif
  67 # ifndef NO_MD5CRYPT_1
  68 #  include <openssl/md5.h>
  69 # endif
  70
  71 static unsigned const char cov_2char[64] = {
  72     /* from crypto/des/fcrypt.c */
  73     0x2E, 0x2F, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35,
  74     0x36, 0x37, 0x38, 0x39, 0x41, 0x42, 0x43, 0x44,
  75     0x45, 0x46, 0x47, 0x48, 0x49, 0x4A, 0x4B, 0x4C,
  76     0x4D, 0x4E, 0x4F, 0x50, 0x51, 0x52, 0x53, 0x54,
  77     0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x61, 0x62,
  78     0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6A,
  79     0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70, 0x71, 0x72,
  80     0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A
  81 };
  82
  83 static int do_passwd(int passed_salt, char **salt_p, char **salt_malloc_p,
  84                      char *passwd, BIO *out, int quiet, int table,
  85                      int reverse, size_t pw_maxlen, int usecrypt, int use1,
  86                      int useapr1);
  87
  88 typedef enum OPTION_choice {
  89     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
  90     OPT_IN,
  91     OPT_NOVERIFY, OPT_QUIET, OPT_TABLE, OPT_REVERSE, OPT_APR1,
  92     OPT_1, OPT_CRYPT, OPT_SALT, OPT_STDIN
  93 } OPTION_CHOICE;
  94
  95 OPTIONS passwd_options[] = {
  96     {"help", OPT_HELP, '-', "Display this summary"},
  97     {"in", OPT_IN, '<', "Pead passwords from file"},
  98     {"noverify", OPT_NOVERIFY, '-',
  99      "Never verify when reading password from terminal"},
 100     {"quiet", OPT_QUIET, '-', "No warnings"},
 101     {"table", OPT_TABLE, '-', "Format output as table"},
 102     {"reverse", OPT_REVERSE, '-', "Switch table columns"},
 103     {"salt", OPT_SALT, 's', "Use provided salt"},
 104     {"stdin", OPT_STDIN, '-', "Read passwords from stdin"},
 105 # ifndef NO_MD5CRYPT_1
 106     {"apr1", OPT_APR1, '-', "MD5-based password algorithm, Apache variant"},
 107     {"1", OPT_1, '-', "MD5-based password algorithm"},
 108 # endif
 109 # ifndef OPENSSL_NO_DES
 110     {"crypt", OPT_CRYPT, '-', "Standard Unix password algorithm (default)"},
 111 # endif
 112     {NULL}
 113 };
 114
 115 int passwd_main(int argc, char **argv)
 116 {
 117     BIO *in = NULL;
 118     char *infile = NULL, *salt = NULL, *passwd = NULL, **passwds = NULL;
 119     char *salt_malloc = NULL, *passwd_malloc = NULL, *prog;
 120     OPTION_CHOICE o;
 121     int in_stdin = 0, in_noverify = 0, pw_source_defined = 0;
 122     int passed_salt = 0, quiet = 0, table = 0, reverse = 0;
 123     int ret = 1, usecrypt = 0, use1 = 0, useapr1 = 0;
 124     size_t passwd_malloc_size = 0, pw_maxlen = 256;
 125
 126     prog = opt_init(argc, argv, passwd_options);
 127     while ((o = opt_next()) != OPT_EOF) {
 128         switch (o) {
 129         case OPT_EOF:
 130         case OPT_ERR:
 131  opthelp:
 132             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
 133             goto end;
 134         case OPT_HELP:
 135             opt_help(passwd_options);
 136             ret = 0;
 137             goto end;
 138         case OPT_IN:
 139             if (pw_source_defined)
 140                 goto opthelp;
 141             infile = opt_arg();
 142             pw_source_defined = 1;
 143             break;
 144         case OPT_NOVERIFY:
 145             in_noverify = 1;
 146             break;
 147         case OPT_QUIET:
 148             quiet = 1;
 149             break;
 150         case OPT_TABLE:
 151             table = 1;
 152             break;
 153         case OPT_REVERSE:
 154             reverse = 1;
 155             break;
 156         case OPT_1:
 157             use1 = 1;
 158             break;
 159         case OPT_APR1:
 160             useapr1 = 1;
 161             break;
 162         case OPT_CRYPT:
 163             usecrypt = 1;
 164             break;
 165         case OPT_SALT:
 166             passed_salt = 1;
 167             salt = opt_arg();
 168             break;
 169         case OPT_STDIN:
 170             if (pw_source_defined)
 171                 goto opthelp;
 172             in_stdin = 1;
 173             break;
 174         }
 175     }
 176     argc = opt_num_rest();
 177     argv = opt_rest();
 178
 179     if (*argv) {
 180         if (pw_source_defined)
 181             goto opthelp;
 182         pw_source_defined = 1;
 183         passwds = argv;
 184     }
 185
 186     if (!usecrypt && !use1 && !useapr1) {
 187         /* use default */
 188         usecrypt = 1;
 189     }
 190     if (usecrypt + use1 + useapr1 > 1) {
 191         /* conflict */
 192         goto opthelp;
 193     }
 194
 195 # ifdef OPENSSL_NO_DES
 196     if (usecrypt)
 197         goto opthelp;
 198 # endif
 199 # ifdef NO_MD5CRYPT_1
 200     if (use1 || useapr1)
 201         goto opthelp;
 202 # endif
 203
 204     if (infile && in_stdin) {
 205         BIO_printf(bio_err, "%s: Can't combine -in and -stdin\n", prog);
 206         goto end;
 207     }
 208
 209     in = bio_open_default(infile, 'r', FORMAT_TEXT);
 210     if (in == NULL)
 211         goto end;
 212
 213     if (usecrypt)
 214         pw_maxlen = 8;
 215     else if (use1 || useapr1)
 216         pw_maxlen = 256;        /* arbitrary limit, should be enough for most
 217                                  * passwords */
 218
 219     if (passwds == NULL) {
 220         /* no passwords on the command line */
 221
 222         passwd_malloc_size = pw_maxlen + 2;
 223         /* longer than necessary so that we can warn about truncation */
 224         passwd = passwd_malloc =
 225             app_malloc(passwd_malloc_size, "password buffer");
 226     }
 227
 228     if ((in == NULL) && (passwds == NULL)) {
 229         /* build a null-terminated list */
 230         static char *passwds_static[2] = { NULL, NULL };
 231
 232         passwds = passwds_static;
 233         if (in == NULL)
 234             if (EVP_read_pw_string
 235                 (passwd_malloc, passwd_malloc_size, "Password: ",
 236                  !(passed_salt || in_noverify)) != 0)
 237                 goto end;
 238         passwds[0] = passwd_malloc;
 239     }
 240
 241     if (in == NULL) {
 242         assert(passwds != NULL);
 243         assert(*passwds != NULL);
 244
 245         do {                    /* loop over list of passwords */
 246             passwd = *passwds++;
 247             if (!do_passwd(passed_salt, &salt, &salt_malloc, passwd, bio_out,
 248                            quiet, table, reverse, pw_maxlen, usecrypt, use1,
 249                            useapr1))
 250                 goto end;
 251         }
 252         while (*passwds != NULL);
 253     } else
 254         /* in != NULL */
 255     {
 256         int done;
 257
 258         assert(passwd != NULL);
 259         do {
 260             int r = BIO_gets(in, passwd, pw_maxlen + 1);
 261             if (r > 0) {
 262                 char *c = (strchr(passwd, '\n'));
 263                 if (c != NULL)
 264                     *c = 0;     /* truncate at newline */
 265                 else {
 266                     /* ignore rest of line */
 267                     char trash[BUFSIZ];
 268                     do
 269                         r = BIO_gets(in, trash, sizeof trash);
 270                     while ((r > 0) && (!strchr(trash, '\n')));
 271                 }
 272
 273                 if (!do_passwd
 274                     (passed_salt, &salt, &salt_malloc, passwd, bio_out, quiet,
 275                      table, reverse, pw_maxlen, usecrypt, use1, useapr1))
 276                     goto end;
 277             }
 278             done = (r <= 0);
 279         }
 280         while (!done);
 281     }
 282     ret = 0;
 283
 284  end:
 285     ERR_print_errors(bio_err);
 286     OPENSSL_free(salt_malloc);
 287     OPENSSL_free(passwd_malloc);
 288     BIO_free(in);
 289     return (ret);
 290 }
 291
 292 # ifndef NO_MD5CRYPT_1
 293 /*
 294  * MD5-based password algorithm (should probably be available as a library
 295  * function; then the static buffer would not be acceptable). For magic
 296  * string "1", this should be compatible to the MD5-based BSD password
 297  * algorithm. For 'magic' string "apr1", this is compatible to the MD5-based
 298  * Apache password algorithm. (Apparently, the Apache password algorithm is
 299  * identical except that the 'magic' string was changed -- the laziest
 300  * application of the NIH principle I've ever encountered.)
 301  */
 302 static char *md5crypt(const char *passwd, const char *magic, const char *salt)
 303 {
 304     /* "$apr1$..salt..$.......md5hash..........\0" */
 305     static char out_buf[6 + 9 + 24 + 2];
 306     unsigned char buf[MD5_DIGEST_LENGTH];
 307     char *salt_out;
 308     int n;
 309     unsigned int i;
 310     EVP_MD_CTX *md, *md2;
 311     size_t passwd_len, salt_len;
 312
 313     passwd_len = strlen(passwd);
 314     out_buf[0] = '$';
 315     out_buf[1] = 0;
 316     assert(strlen(magic) <= 4); /* "1" or "apr1" */
 317     OPENSSL_strlcat(out_buf, magic, sizeof out_buf);
 318     OPENSSL_strlcat(out_buf, "$", sizeof out_buf);
 319     OPENSSL_strlcat(out_buf, salt, sizeof out_buf);
 320     assert(strlen(out_buf) <= 6 + 8); /* "$apr1$..salt.." */
 321     salt_out = out_buf + 2 + strlen(magic);
 322     salt_len = strlen(salt_out);
 323     assert(salt_len <= 8);
 324
 325     md = EVP_MD_CTX_new();
 326     if (md == NULL)
 327         return NULL;
 328     EVP_DigestInit_ex(md, EVP_md5(), NULL);
 329     EVP_DigestUpdate(md, passwd, passwd_len);
 330     EVP_DigestUpdate(md, "$", 1);
 331     EVP_DigestUpdate(md, magic, strlen(magic));
 332     EVP_DigestUpdate(md, "$", 1);
 333     EVP_DigestUpdate(md, salt_out, salt_len);
 334
 335     md2 = EVP_MD_CTX_new();
 336     if (md2 == NULL)
 337         return NULL;
 338     EVP_DigestInit_ex(md2, EVP_md5(), NULL);
 339     EVP_DigestUpdate(md2, passwd, passwd_len);
 340     EVP_DigestUpdate(md2, salt_out, salt_len);
 341     EVP_DigestUpdate(md2, passwd, passwd_len);
 342     EVP_DigestFinal_ex(md2, buf, NULL);
 343
 344     for (i = passwd_len; i > sizeof buf; i -= sizeof buf)
 345         EVP_DigestUpdate(md, buf, sizeof buf);
 346     EVP_DigestUpdate(md, buf, i);
 347
 348     n = passwd_len;
 349     while (n) {
 350         EVP_DigestUpdate(md, (n & 1) ? "\0" : passwd, 1);
 351         n >>= 1;
 352     }
 353     EVP_DigestFinal_ex(md, buf, NULL);
 354
 355     for (i = 0; i < 1000; i++) {
 356         EVP_DigestInit_ex(md2, EVP_md5(), NULL);
 357         EVP_DigestUpdate(md2, (i & 1) ? (unsigned const char *)passwd : buf,
 358                          (i & 1) ? passwd_len : sizeof buf);
 359         if (i % 3)
 360             EVP_DigestUpdate(md2, salt_out, salt_len);
 361         if (i % 7)
 362             EVP_DigestUpdate(md2, passwd, passwd_len);
 363         EVP_DigestUpdate(md2, (i & 1) ? buf : (unsigned const char *)passwd,
 364                          (i & 1) ? sizeof buf : passwd_len);
 365         EVP_DigestFinal_ex(md2, buf, NULL);
 366     }
 367     EVP_MD_CTX_free(md2);
 368     EVP_MD_CTX_free(md);
 369
 370     {
 371         /* transform buf into output string */
 372
 373         unsigned char buf_perm[sizeof buf];
 374         int dest, source;
 375         char *output;
 376
 377         /* silly output permutation */
 378         for (dest = 0, source = 0; dest < 14;
 379              dest++, source = (source + 6) % 17)
 380             buf_perm[dest] = buf[source];
 381         buf_perm[14] = buf[5];
 382         buf_perm[15] = buf[11];
 383 #  ifndef PEDANTIC              /* Unfortunately, this generates a "no
 384                                  * effect" warning */
 385         assert(16 == sizeof buf_perm);
 386 #  endif
 387
 388         output = salt_out + salt_len;
 389         assert(output == out_buf + strlen(out_buf));
 390
 391         *output++ = '$';
 392
 393         for (i = 0; i < 15; i += 3) {
 394             *output++ = cov_2char[buf_perm[i + 2] & 0x3f];
 395             *output++ = cov_2char[((buf_perm[i + 1] & 0xf) << 2) |
 396                                   (buf_perm[i + 2] >> 6)];
 397             *output++ = cov_2char[((buf_perm[i] & 3) << 4) |
 398                                   (buf_perm[i + 1] >> 4)];
 399             *output++ = cov_2char[buf_perm[i] >> 2];
 400         }
 401         assert(i == 15);
 402         *output++ = cov_2char[buf_perm[i] & 0x3f];
 403         *output++ = cov_2char[buf_perm[i] >> 6];
 404         *output = 0;
 405         assert(strlen(out_buf) < sizeof(out_buf));
 406     }
 407
 408     return out_buf;
 409 }
 410 # endif
 411
 412 static int do_passwd(int passed_salt, char **salt_p, char **salt_malloc_p,
 413                      char *passwd, BIO *out, int quiet, int table,
 414                      int reverse, size_t pw_maxlen, int usecrypt, int use1,
 415                      int useapr1)
 416 {
 417     char *hash = NULL;
 418
 419     assert(salt_p != NULL);
 420     assert(salt_malloc_p != NULL);
 421
 422     /* first make sure we have a salt */
 423     if (!passed_salt) {
 424 # ifndef OPENSSL_NO_DES
 425         if (usecrypt) {
 426             if (*salt_malloc_p == NULL) {
 427                 *salt_p = *salt_malloc_p = app_malloc(3, "salt buffer");
 428             }
 429             if (RAND_bytes((unsigned char *)*salt_p, 2) <= 0)
 430                 goto end;
 431             (*salt_p)[0] = cov_2char[(*salt_p)[0] & 0x3f]; /* 6 bits */
 432             (*salt_p)[1] = cov_2char[(*salt_p)[1] & 0x3f]; /* 6 bits */
 433             (*salt_p)[2] = 0;
 434 #  ifdef CHARSET_EBCDIC
 435             ascii2ebcdic(*salt_p, *salt_p, 2); /* des_crypt will convert back
 436                                                 * to ASCII */
 437 #  endif
 438         }
 439 # endif                         /* !OPENSSL_NO_DES */
 440
 441 # ifndef NO_MD5CRYPT_1
 442         if (use1 || useapr1) {
 443             int i;
 444
 445             if (*salt_malloc_p == NULL) {
 446                 *salt_p = *salt_malloc_p = app_malloc(9, "salt buffer");
 447             }
 448             if (RAND_bytes((unsigned char *)*salt_p, 8) <= 0)
 449                 goto end;
 450
 451             for (i = 0; i < 8; i++)
 452                 (*salt_p)[i] = cov_2char[(*salt_p)[i] & 0x3f]; /* 6 bits */
 453             (*salt_p)[8] = 0;
 454         }
 455 # endif                         /* !NO_MD5CRYPT_1 */
 456     }
 457
 458     assert(*salt_p != NULL);
 459
 460     /* truncate password if necessary */
 461     if ((strlen(passwd) > pw_maxlen)) {
 462         if (!quiet)
 463             /*
 464              * XXX: really we should know how to print a size_t, not cast it
 465              */
 466             BIO_printf(bio_err,
 467                        "Warning: truncating password to %u characters\n",
 468                        (unsigned)pw_maxlen);
 469         passwd[pw_maxlen] = 0;
 470     }
 471     assert(strlen(passwd) <= pw_maxlen);
 472
 473     /* now compute password hash */
 474 # ifndef OPENSSL_NO_DES
 475     if (usecrypt)
 476         hash = DES_crypt(passwd, *salt_p);
 477 # endif
 478 # ifndef NO_MD5CRYPT_1
 479     if (use1 || useapr1)
 480         hash = md5crypt(passwd, (use1 ? "1" : "apr1"), *salt_p);
 481 # endif
 482     assert(hash != NULL);
 483
 484     if (table && !reverse)
 485         BIO_printf(out, "%s\t%s\n", passwd, hash);
 486     else if (table && reverse)
 487         BIO_printf(out, "%s\t%s\n", hash, passwd);
 488     else
 489         BIO_printf(out, "%s\n", hash);
 490     return 0;
 491
 492  end:
 493     return 1;
 494 }
 495 #else
 496
 497 int passwd_main(int argc, char **argv)
 498 {
 499     BIO_printf(bio_err, "Program not available.\n");
 500     return (1);
 501 }
 502 #endif